Originally Aired: January 10, 1960

Gunsmoke #405, "Lukes Law," presents a clash between frontier justice and modern law enforcement. When old-timer Luke Burris is beaten and left bloody by Smed Moley following a public confrontation in Dodge City, his son Jess comes to Marshal Matt Dillon seeking help. Luke refuses to press charges, insisting he's always handled his own troubles without the law and isn't about to start now. Despite Matt's warnings that times have changed, the stubborn pioneer remains determined to settle the score himself, leaving the Marshal powerless to intervene without a willing witness.

The situation escalates when Smed Moley, emboldened by Luke's refusal to involve the law, begins bragging around town about the beating. Matt confronts Moley at the Long Branch and warns him to stay away from the Burris place, but the damage is done. When Moley rides out to the Burris homestead looking for more trouble, young Jess faces an impossible choice between his father's fierce independence and the deadly consequences of frontier justice. The episode explores the tensions between the old ways of the West and the rule of law that Marshal Dillon represents.